Insulating material



Illl

r": '1 all il lltt Whlhu s lll ll -lll'lllitwllltlii MATERIAL Be it known that ll Josnrr-r P. Donavon, a citizen of the United States, residing at 'lhompoc, in the county oi @anta Barbara and State 0t California, have invented new and useful improvements in Insulating Materials of which the following is a specificaticn.

The present invention relates to heat insulating material, the object of the invention being to provide a material of this hind which will be inexpensive,

in forming my improved heatinsulating material l min with diatomaceous earth or similar material. the shells of lrernels, either of nuts or fruit, as, tor instance, oi almonds or the pits oi apricots, ground to pass through eight or ten mesh. l min these substances in the proportion of one part by weight oi the fruit pits, and two parts by weight of the diatomaceous earth. in case nut shells are used as, tor instance, almond shells, ll talre a smaller proportion by weight of said shells on account of their being com-- paratively light. The truit pits which it preter to use are those ol apricots. The earth and ground lrernel shells are dam pened and mined and molded into the shapes reunited then dried and calcined.

specification of ltetters llatent.

Application filed august tit, this.

will:

Patented ul v ti 'lldtdo lterial in. seated The quality of heat insulating material is determined to a considerable extent by the number of voids or air cells within, the material, the greater the number of air cells, the greater being the heat insulating properties of the material. l have found that nut shells or fruit pits leave a very small amount of ash when burned and l have talren advantage of this condition in the production of a highly eliicient thermal insulation.

When the molded shapes are calcined, the i shells are reduced to ashes and. since the volume of the ash is very small, in. comparison with the volume of the shells. a multiplicity of cells or voids are termed within the molded shape.

1. Heat insulating material, comprising lrieselguhr and ground kernel shells mined substantially in the proportion specified, and calcined.

2. Heat insulating material comprising a block ol ltieselguhr having voids therein termed by the incineration oi pieces of hernal shells embedded in the bloclr.

JUSEPH 1P DUNAVUN. 

